i-DDrop: interfacial dewetting and drainage optical platform

a technology of optical platform and interfacial dewetting, which is applied in the field of iddrop : interfacial dewetting and drainage optical platform, can solve the problems of inability to maintain tear film, encourage dewetting and dryness, bacterial infections, and potential discontinuation of lens products, and achieve the effect of predicting in vivo comfort and functioning of lens products

Active Publication Date: 2015-04-16
THE BOARD OF TRUSTEES OF THE LELAND STANFORD JUNIOR UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The patent is about a new device called i-DDrOP that can test the effectiveness of lens care solutions and the degradation of the lens surface coatings. This device is designed to mimic the natural tear film dynamics and can provide qualitative and quantitative information on drainage and dewetting, which can help predict the comfort and functioning of contact lenses. The i-DDrOP aims to be a more cost-effective alternative to clinical trials.

Problems solved by technology

This fouling can induce instability of the tear film and encourage dewetting and dryness.
The degradation of the lens will impact the comfort a user feels over time and can result in inflammatory reactions, bacterial infections and potential discontinuation of the lens product.

Method used

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  • i-DDrop: interfacial dewetting and drainage optical platform
  • i-DDrop: interfacial dewetting and drainage optical platform
  • i-DDrop: interfacial dewetting and drainage optical platform

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Embodiment Construction

[0029]During a blink-cycle on a human eye, there are various processes that occur such as evaporation, osmotic flow and tangential flow. These processes result in the thinning of the tear film, which we refer to as drainage (FIG. 1).

[0030]FIG. 2 illustrates dewetting in the context of i-DDrOP, the Interfacial Dewetting and Drainage Optical Platform of this invention. Once the tear film has drained due to the processes shown in FIG. 1, the tear film breaks up or dewets. This break-up or dewetting is exacerbated when you have naturally occurring tear film proteins depositions on the contact lens surface.

[0031]FIG. 3 shows a schematic explaining the mathematical model used to described drainage according to an exemplary embodiment of the invention. The top left shows a hemispherical contact lens on top of which a liquid film is draining. The liquid film has an insoluble monolayer on top of it, which represents the tear film lipids. The dimensionless numbers describe the assumptions and...

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Abstract

An interfacial dewetting and drainage optical platform (i-DDrOP) is provided which is an instrument that can quantify drainage and dewetting processes of in vitro model tear films covering contact lenses.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS[0001]This application claims priority from U.S. Provisional Patent Application 61 / 889,943 filed Oct. 11, 2013, which is incorporated herein by reference.FIELD OF THE INVENTION[0002]This invention relates to methods and systems for analyzing or examining the drainage and wettability characteristics of contact lenses and lens care products.BACKGROUND OF THE INVENTION[0003]Insoluble lipids serve vital functions in our bodies and interact with biomedical devices, e.g. the tear film on a contact lens. Over a period of time, these naturally occurring lipids form interfacial coatings that modify the wettability characteristics of these foreign synthetic surfaces. There is a need in the art to develop methods and system that allow us to examine the deposition and consequences of tear film lipids on for example silicone hydrogel (SiHy) contact lenses.SUMMARY OF THE INVENTION[0004]The invention pertains to methods and systems for examining the interacti...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): A61B3/10
CPCA61B3/101
Inventor BHAMLA, MOHAMMED SAADFULLER, GERALD G.
Owner THE BOARD OF TRUSTEES OF THE LELAND STANFORD JUNIOR UNIV
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